Valmiki Ramayana Yuddha Kanda Sarga 113 Shloka 16

यः he who, सुरैः Suras, हन्तुम् to kill, न शक्यः not possible, यक्षै: Yaksha, न not, तथा so also, असुरैः Asuras, न not, सः he, अयम् this, असत्त्वः weak, कश्चिदिव like one devoid of strength, मर्त्येन by death, मृत्युम् death, लम्भितः resting

"He, who could not be killed by Suras, Asuras or Yakshas, such a hero lies like a weak person devoid of strength, killed by a mortal, is resting."